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A fetus was an unborn child. Fetuses were technically called "fetuses" until the moment of birth, as evidenced by the fact that DoctorKatherine Pulaski continued to explicitly monitor the "fetal pulse" during delivery. (TNG: "The Child")

Generally, a fetus matured in a single, natural womb until the moment of birth, but there were exceptions. Some fetuses, particularly those of the Borg Collective, were known to have required no natural wombs at all. (TNG: "Q Who"; VOY: "Drone"; ENT: "Similitude") In other extreme cases, it was possible to implant the fetus into another womb. The fetal existence of Keiko O'Brien's second child was deliberately divided, due to an accident, between the wombs of his mother and Kira Nerys. (DS9: "Body Parts", et al.)

The Doctor's scans of B'Elanna Paris allowed him to construct very elaborate three-dimensional holograms of the fetus that would become Miral Paris. He was also able to predict a birth defect – a deviated spine – and to correct it while the child was still in the womb. Later, B'Elanna accessed these fetal holograms in order to get the computer to suggest additional pre-natal modifications that would de-emphasize the child's Klingongenes. (VOY: "Lineage")